MNT Update issue templates (#674)

Author: glemaitre

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us reproduce and correct the bug
+title: "[BUG]"
+labels: bug
+assignees: ''
+
+---
+
+#### Describe the bug
+A clear and concise description of what the bug is.
+
+#### Steps/Code to Reproduce
+<!--
+Example:
+```python
+from sklearn.feature_extraction.text import CountVectorizer
+from sklearn.decomposition import LatentDirichletAllocation
+
+docs = ["Help I have a bug" for i in range(1000)]
+
+vectorizer = CountVectorizer(input=docs, analyzer='word')
+lda_features = vectorizer.fit_transform(docs)
+
+lda_model = LatentDirichletAllocation(
+    n_topics=10,
+    learning_method='online',
+    evaluate_every=10,
+    n_jobs=4,
+)
+model = lda_model.fit(lda_features)
+```
+If the code is too long, feel free to put it in a public gist and link
+it in the issue: https://gist.github.com
+-->
+
+```
+Sample code to reproduce the problem
+```
+
+#### Expected Results
+<!-- Example: No error is thrown. Please paste or describe the expected results.-->
+
+#### Actual Results
+<!-- Please paste or specifically describe the actual output or traceback. -->
+
+#### Versions
+<!--
+Please run the following snippet and paste the output below.
+For scikit-learn >= 0.20:
+import sklearn; sklearn.show_versions()
+For scikit-learn < 0.20:
+import platform; print(platform.platform())
+import sys; print("Python", sys.version)
+import numpy; print("NumPy", numpy.__version__)
+import scipy; print("SciPy", scipy.__version__)
+import sklearn; print("Scikit-Learn", sklearn.__version__)
+import imblearn; print("Imbalanced-Learn", imblearn.__version__)
+-->
+
+
+<!-- Thanks for contributing! -->

.github/ISSUE_TEMPLATE/documentation-improvement.md

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+---
+name: Documentation improvement
+about: Create a report to help us improve the documentation
+title: "[DOC]"
+labels: Documentation, help wanted, good first issue
+assignees: ''
+
+---
+
+#### Describe the issue linked to the documentation
+
+Tell us about the confusion introduce in the documentation.
+
+#### Suggest a potential alternative/fix
+
+Tell us how we could improve the documentation in this regard.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an new algorithm, enhancement to an existing algorithm, etc.
+title: "[ENH]"
+labels: enhancement
+assignees: ''
+
+---
+
+<--
+If you want to propose a new algorithm, please refer first to the scikit-learn inclusion criterion:
+https://scikit-learn.org/stable/faq.html#what-are-the-inclusion-criteria-for-new-algorithms
+-->
+
+#### Is your feature request related to a problem? Please describe
+
+#### Describe the solution you'd like
+
+#### Describe alternatives you've considered
+
+#### Additional context

.github/ISSUE_TEMPLATE/other--blank-template-.md

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+---
+name: Other (blank template)
+about: For all other issues to reach the community...
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: If you have a usage question
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**
+If your issue is a usage question, submit it here instead:
+- The imbalanced learn gitter: https://gitter.im/scikit-learn-contrib/imbalanced-learn
+**

.github/ISSUE_TEMPLATE/usage-question.md

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+---
+name: Usage question
+about: If you have a usage question
+title: "[SO]"
+labels: question
+assignees: ''
+
+---
+
+** If your issue is a usage question, submit it here instead:**
+- **The imbalanced learn gitter: https://gitter.im/scikit-learn-contrib/imbalanced-learn**
+- **StackOverflow with the imblearn (or imbalanced-learn) tag:https://stackoverflow.com/questions/tagged/imblearn**
+
+We are going to automatically close this issue if this is not link to a bug or an enhancement.